An aqueous buffer is prepared by adding 100 ml of 0.1 ~mol t ⁻¹ acetic acid to 50 ml of 0.2 ~mol I ⁻¹ of sodium acetate. If pKa of acetic acid is 4.76 , the pH of the buffer is

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Correct answer: D. 4.76

Meq of CH ₃ COOH =100 0.1 1=10 Meq of CH ₃ COONa =50 0.2 1=10 array l pH = pK _ a + [ CH ₃ COO ⁻ ] [ CH ₃ COOH ] pH =4.76+ 10 10 pH =4.76+ 1 pH =4.76 array

An aqueous buffer is prepared by adding 100 ml of 0.1 ~mol t ⁻¹ acetic acid to 50 ml of 0.2 ~mol I ⁻¹ of sodium acetate. If pKa of acetic acid is 4.76 , the pH of the buffer is

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